Revert "Remove no longer used PerfStat profiler"
Revert "Remove no longer used PerfStat profiler"

This reverts commit 664d8b0c039ecd09e340b89e06d1507ec63bb8af.

We intend to use it for when we already have self-profile data

nrc/rustc-perf,nrc/rustc-perf,nrc/rustc-perf